The ? (gamma) scale is a non-octave repeating musical scale. In one interpretation, it splits the perfect fifth into 20 equal parts of approximately 35.1 cents each.[] In another, it splits the neutral third into two equal parts, or ten equal parts of approximately 35.1 cents each[1]Play(help·info). At 35.1 cents per step this totals 34.188 steps per octave.[1] More accurately, but still approximately, the gamma scale step is 35.099 cents and there are 34.1895 per octave.[2]